I've seen similar posts, but not similar enough to make me feel 100% sure so here we go...

Once upon a time there was a hot tub on the back patio of my house. The wire appears to be 4 gauge wire and there is a junction box already installed on the back wall. The tub is gone now, and I'm converting the room on the other side of that wall into a laundry room. It seemed like a natural place to tie into, reducing the breaker to 30 amp and going through the wall.

It looks as though 10-3 is the norm for a clothes dryer so my question is, is it OK to have 4 gauge running into the junction box and 10 gauge running out of the box to the dryer outlet? 4 to 10 is a pretty big jump so I'm just not sure.

Thanks!

I've seen similar posts, but not similar enough to make me feel 100% sure so here we go...

Once upon a time there was a hot tub on the back patio of my house. The wire appears to be 4 gauge wire and there is a junction box already installed on the back wall. The tub is gone now, and I'm converting the room on the other side of that wall into a laundry room. It seemed like a natural place to tie into, reducing the breaker to 30 amp and going through the wall.

It looks as though 10-3 is the norm for a clothes dryer so my question is, is it ok to have 4 gauge running into the junction box and 10 gauge running out of the box to the dryer outlet? 4 to 10 is a pretty big jump so I'm just not sure.

Thanks!
Are there 4 wires going to the subpanel?

There are three wires in one bundle, so I guess that is 4-3? Then there is a separate wire on its own. So yes, four wires total.

If there is an individual wire ran with the cable, and it is not included inside the cable, this is not allowed. Sounds like someone added a fourth wire as an equipment ground for the hot tub.

Splicing from #4 to #10 is fine using a proper mechanical connector, of which there are several available, such as split bolts, which need to be taped very well, or there are two port lugs already encapsulated and insulated.